Brake drum



Feb. 20, 1934.

F. H. LEJEUNE BRAKE DRUM Filed April 11. 1952 2 Sheets-Sheet l Feb. 20, 1934. H. LEJEUNE 1,947,782

BRAKE DRUM Filed April-ll, 1932 2 Sheets-Sheet 2 mu" E5 Patented Feb. 20, 1 934 UNITED STATES PATENT OFFICE Kelsey-Hayes Wheel Corporation,

Detroit,

Mich, a corporation of New York Application April 11, 1932. Serial No. 604,550

11 Claims.

taken in connection with the accompanying drawings, in which Figure 1 is an elevation of a brake drum showmgan embodiment of my invention;

. Figures 2 and 3 are cross sections on the lines 2-2 and 3-3, respectively, of Figure 1;

Figures 4 and 5 are views similar to Figure 2, showing other embodiments of my invention;

Figure 6 is a view similar to Figure 1, showing another embodiment of my invention;

Figure 7 is a cross section on the line 7-7 of Figure 6;

another embodiment of my invention.

As shown in Figures 1, and 2 and 3, the brake drum comprises the body 1 and the brake engaging member 2, the body being formed of sheet metal and, more particularly, sheet steel and stamped or drawn to shape and the brake engaging member being formed of cast iron, and, more particularly, being centrifugally cast. The body 1 has the web 3 and the peripheral annular flange 51 which is provided at its free edge with the peripherally spaced barrel portions 5. The centrifugally cast brake engaging member has the inner cylindrical brake engaging face 6 and ex tends within the annular flange 4 and has intermediate its edges and substantially midway of its width the radially outwardly extending peripherally spaced projections! which fit between the barrel portions 5. 8 is a wire ring extending through and rotatably mounted in the Figure 8 is a view similar to Figure '7 showingtending beyond the free edge of the annular flange to formthe outer face of the brake engaging member beyond this annular flange. The fixture with the body in place is rotated and during the rotation the molten metal is poured and g0 centrifugally cast. The centrifugal casting is accomplished without fusing or molecular bonding of the brake engaging member to the annular flange and its barrel portions and this may be accomplished by controlling the relative temo5 peratures or by a suitable protective coating upon the portions of the annular flange and its barrel portions with which the molten metal comes into contact. However, the brake engaging member fuses with and is molecularly bonded to the wire 7 ring 8.

With this arrangement, it will be noted that the annular brake engaging member 2 is connected to the brake drum body and, more particularly, the annular flange of this body, so that the brake engaging member may move relative to the brake drum body without distorting the latter during the operation.

In the modifications shown in Figures 4 and 5, the annular brake engaging members are pref- 'erably formed separately from the brake drum bodies. These brake engaging members are preferably centrifugally cast and then assembled with the brake drum bodies by connecting the two together. As shown in Figure 4, the sheet steel brake drum body 9 has the web 10 and the peripheral annular flange 11 which is formed with peripherally spaced tongues at its free edge. The annular centrifugally cast brake engaging member 12 is provided intermediate its edges and preferably midway thereof with the radially outwardly extending peripherally spaced projections 13 which are adapted to fit between the tongues at the free edge of the annular flange 11. When centrifugally casting this annular brake engaging member, the projections 13 are cast about and molecularly bonded with the wire ring 14 and one of the projections is cast about theadjacent ends of this wire ring. The brake engaging memberis assembled with the brake drum body by inserting the former into the latter and then by bending over the tongues at the free edgev of the annular flange to form the barrel portions 15, these tongues being bent radially outwardly and toward the main portion of the annular flange. As shown in Figure 5, the arrangement of parts and also the method of assembly is in general the same as that disclosed in connection with Figure 4, with the exception that the peripherally spaced tongues at the free edge oi the annular flange 16 no nect the annular brake engaging member to the brake drum body.

As shown in Figures 6 and '7, the brake drum body comprises the stamped web 18 which is provided at its periphery with the peripherally spaced barrel portions 19 extending around the wire ring 20. The annular brake engaging member 21 has at its edge adjacent to the web 18the peripherally spaced projections 22 for fitting between the projections 19 and these projections 22 are cast around and molecularly bonded to the portions of the wire ring between the projections 19. The brake engaging member 21 is preferably formed by centrifugally casting the same in place and around the wire ring 20 with the latter extending through the barrel portions 22.

Figure 8 discloses another modification in which the brake drum comprises the sheet steel web 23 preferably formed by a stamping operation and the sheet steel annular flange 24 preferably formedby rolling the same and also the annular brake engaging member 25 which is preferably a liner of cast iron centrifugally cast into theannular flange and fused or molecularly bonded thereto. The annular flange 24 is connected to the web 23 by means of the wire ring 26 which ,extends through the annular series of alternate barrel portions formed upon the web and the laterally extending portion or back 27- of the annular flange. e

What I claim as my invention is:

1. A brake drum, comprising a body, an annular member connected to said body and an annular brake engaging member molecularly bonded to said annular member.

2. A brake drum, comprising a body, an annular member connected to said body and an annular brake engaging member cast upon said annular member. I

3. A brake drum, comprising a body, a wire ring connected to said body and an annular brake engaging member molecularly bonded to said wire ring.

v of the brake drum body are bent radially inwardly 4. A brake drum, comprising a body, a wire ring connected to said body and an annular brake engaging member cast upon said wirering.

5. A brake drum, comprising an annular flange having peripherally spaced barrel portions, a wire ring extending through said barrel portions and a brake engaging member having portions between said barrel portions engaging said wire ring.

6. A brake drum, comprising a body having peripherally spaced barrel portions, a wire ring extending through said barrel portions and a brake engaging member having portions between said barrel portions engaging said wire ring.

7. A brake drum, comprising a web havingperipherally spaced barrel portions, a wire ring extending through said barrel portions and a brake engaging member having portions between said barrelportions engaging said wire ring.

8. A brake drum, comprising a body, an annular brake engaging member and an annular member extending alternately through said body and member for connecting the same to each other.

9. A brake drum, comprising a body member,

an annular brake engaging member and an annu- 11. A brake drum, comprising a web member,

an annular flange member, an annular member for connecting said first merTtioned members to each other, one of said first mentioned members member.

FRANK H. LEJEUNE. 

